From: Daniel Vetter <daniel@ffwll.ch>
To: Matthew Wilcox <willy@infradead.org>
Cc: dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 01/34] drm: Convert drm_minors_idr to XArray
Date: Fri, 22 Feb 2019 10:55:10 +0100 [thread overview]
Message-ID: <20190222095510.GC2665@phenom.ffwll.local> (raw)
In-Reply-To: <20190222091114.GW2665@phenom.ffwll.local>
On Fri, Feb 22, 2019 at 10:11:14AM +0100, Daniel Vetter wrote:
> On Thu, Feb 21, 2019 at 10:41:21AM -0800, Matthew Wilcox wrote:
> > Divide all the indices by 64 to save memory.
> >
> > Signed-off-by: Matthew Wilcox <willy@infradead.org>
>
> Pretty sure this goes boom. Our char device minor allocation scheme is
>
> device 0: card0=0, renderD0=64
> device 1: card1=1, renderD1=65
> ...
>
> I think your scheme aliases all devices with the first one.
>
> And yes the minor(cardX) + 64 == minor(renderDX) is uapi :-)
>
> If you want to save space we'd need to move the minor allocation from
> drm_minor to drm_device (with a very strange allocation scheme of blocks
> of 64 entries, every 128 entries). That would also solve the issue with
> the current scheme potentially racing if you load multiple drivers at the
> same time (except for drm_global_mutex, but that's more an accident than
> intention). Not sure if worth the bother.
>
> Or maybe coffee hasn't kicked in yet over here and I'm missing something?
btw if you want to test locally, enable vkms.ko and vgem.ko and load them
both, for at least 2 drm drivers.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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next prev parent reply other threads:[~2019-02-22 9:55 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-21 18:41 [PATCH 00/34] Convert DRM to XArray Matthew Wilcox
2019-02-21 18:41 ` [PATCH 01/34] drm: Convert drm_minors_idr " Matthew Wilcox
2019-02-22 9:11 ` Daniel Vetter
2019-02-22 9:55 ` Daniel Vetter [this message]
2019-02-22 15:13 ` Matthew Wilcox
2019-02-21 18:41 ` [PATCH 02/34] drm: Convert aux_idr " Matthew Wilcox
2019-02-25 17:57 ` Ville Syrjälä
2019-02-25 18:42 ` Matthew Wilcox
2019-02-25 18:50 ` Ville Syrjälä
2019-02-21 18:41 ` [PATCH 03/34] drm: Convert object_name_idr " Matthew Wilcox
2019-02-22 9:17 ` Daniel Vetter
2019-02-21 18:41 ` [PATCH 04/34] drm: Convert object_idr " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 05/34] drm: Convert syncobj_idr " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 06/34] drm: Convert magic_map " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 07/34] drm: Convert lessee_idr " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 08/34] drm: Remove linked lists for lessees Matthew Wilcox
2019-02-21 18:41 ` [PATCH 09/34] drm: Convert ctx_idr to XArray Matthew Wilcox
2019-02-21 18:41 ` [PATCH 10/34] drm: Convert tile_idr " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 11/34] drm: Convert crtc_idr " Matthew Wilcox
2019-02-22 9:40 ` Daniel Vetter
2019-02-22 15:32 ` Matthew Wilcox
2019-02-22 17:12 ` Daniel Vetter
2019-02-21 18:41 ` [PATCH 12/34] drm/agp: Convert bo_list_handles " Matthew Wilcox
2019-02-25 16:06 ` Christian König
2019-02-25 16:39 ` Matthew Wilcox
2019-02-21 18:41 ` [PATCH 13/34] drm/amdgpu: Convert ctx_handles " Matthew Wilcox
2019-02-25 16:07 ` Christian König
2019-02-25 16:39 ` Matthew Wilcox
2019-02-25 16:59 ` Koenig, Christian
2019-02-25 18:47 ` Matthew Wilcox
2019-02-21 18:41 ` [PATCH 14/34] drm/amdgpu: Convert pasid_idr " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 15/34] drm/amdkfd: Convert event_idr " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 16/34] drm/amdkfd: Convert alloc_idr " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 17/34] drm/etnaviv: Convert fence_idr " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 18/34] drm/i915: Convert handles_vma " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 19/34] drm/i915: Convert spt_tree " Matthew Wilcox
2019-02-21 18:41 ` [PATCH 20/34] drm/i915: Convert page_track_tree " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 21/34] drm/i915: Convert get_page " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 22/34] drm/i915: Convert object_idr to IDA Matthew Wilcox
2019-02-21 18:42 ` [PATCH 23/34] drm/i915: Convert context_idr to XArray Matthew Wilcox
2019-02-21 18:42 ` [PATCH 24/34] drm/i915: Convert metrics_idr " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 25/34] drm/i915: Convert vgpus_idr " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 26/34] drm/qxl: Convert release_idr " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 27/34] drm/qxl: Convert surf_id_idr " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 28/34] drm/tegra: Convert contexts IDR " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 29/34] drm/vc4: Convert perfmon " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 30/34] drm/sis: Convert object_idr " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 31/34] drm/vgem: Convert fence_idr " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 32/34] drm/via: Convert object_idr " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 33/34] drm/vmwgfx: Convert base IDR " Matthew Wilcox
2019-02-21 18:42 ` [PATCH 34/34] drm/vmwgfx: Convert res_idr " Matthew Wilcox
2019-02-22 9:54 ` [PATCH 00/34] Convert DRM " Daniel Vetter
2019-02-24 4:21 ` Matthew Wilcox
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